Double leg construction for derricks with equalizing means



Aug, 1932- 1.. A. RAWSON 1,871,130

DOUBLE LEG CONSTRUCTION FOR DERRICKS WITH EQUALIZING MEANS Filed April 19, 1930 2 Sheets-Sheet l A I'TORNEK 2 Sheets-Sheet 2 L. A RAWSON Filed April 19, 1950 DOUBLE LEG CONSTRUCTION FOR DEHRICKS WITH'EQUALIZING MEANS Aug. 9, 1932.

[/v VE/V TOR 55445 A. /?A wso,

A r rdmy r Patented Aug. 9, 1932 LESLIEHAI- RAwsom or LOS-ZAINGELES} GALIFQRNIA;assmnoamo EivIsoo' "DERRICK" & EQUIPMENT 001mm; OFYLLOAS -ANGELES, QAIQIFOBNIALMA") conronnmron ori Y onmroxmm V nounnnz-mnaaconsmnomom Fen: nERRIoKswIT-n:normmzms mnansu AppI-ication fi a} hprn le, 1930 seriai m. 45,631,

Myfiiivention relatesto a derrick as is employed inythe oil prfoducingindustry, haw ing: double leg, constructions extending between the baseof the derrick and'the crown g thereof; Thei invention relates to an iIlVGIP tion similar to that disclosed in "my'fcopen'dy ing application 'entitledfDouble leglcon'stru c tion for Vderrick filed April 23, 1930,Serial No. 446,555; 7 Derricksof this character form pa-rxt of the prior art, and the broadiidea of aclerrick having double leg constructions does not of itselfconstithte my present invention In such de'rricks referred to, 'thef-loadfis proportioned on the primary and secondary legs-of each double. 'leg construction by a manually; operable'mea-ns, and the to the re- V liance on thegue'ssworkof the Workman for proportioning,, the load it is never known Whethenor not the load is properlydistrih T i uted on the legs. One of the common-double leg constructions provides an adjustment means inoneof the legswhereby theleg'may; belengthened and thus causedto'ca'rry a part of the load of the crown. The Workr'nan usu- 125' ally operates the lengthening Ineansuntil he thinks that-the 1oadis}'prop er1y 1istribi1ted..

On many occasions the. Workmans ndgnient has been greatly n" error and ntense strains haye been pla'ced-on one ofthe'legstothe in a. J y Fig.4. vides a double" 1eg ,con struction fora derrickinlwhich' the plfilnary' 6 jnry' of the derrick.

My intention pro and secondaryflegsare automatically eaused to" carry predetermined proportions 0 f the load carried Icy-the crown ofthklerrick and it absolutely eliminates the-hmnan element which is involved in the making of the adjustm-ents-inthe dei ricks of the prior art.

In the clerni-ck "ohm-y invention a predetere onclary legs...

" following descri mineclproportion. of the loafcarried by the: primary ancl secondary legs never 1. varies throughout athe: use; of "they; doubts ileg cone strnction inwthe' derrick? Due to arm-equalize ing' means Which constitutes fpartofmy in? vention, anyslig-ht distortiomor settling ;of the derrick will not, impair v the} -operation lot a a the legs; norz'will it change the p'roportionsof the weight carried by L .the primary and; v sec-t The equalizing manta V .posi.

" PA -FE;r.tr caij ti'oned relative the thr parts of the' derrick so that the loadis transmitted through this equalizing; means, 'Ihe equalizing means automatically; positions itself so that it places theproper: load on the primary and secondary legs anclfcluring the use of the der rick Will maintain the proper proportionsof the 10am N A Other advan gesfofmy inyention and thel Y important featufes will be'pointe'd ontin. the

my inventionzare illhst-ratedQ. 1 v

In the zaccompany ing .drawin .s 5 1' isxaneleygational yiewlifiustrating a clerrickfincorporatingthe features of my invention,

; Fig 3 "is" anteleyat onalfyiewingestion Til showinga double leg ,constr ction of myjn vention in Which'the equalizing means isin i Fig. 5 isa 'sectiontaken on the Fig.6 is a section taken on the line 6'j6fof g 7 v v it The derrickinlyvhichim ;invention is in; corporatecl has a base construction 11,, a

, crown construction12;)ancl a pluralityfof double leg constructions 7 14; Accordingto usual derrick, practioe jthere is a; double leg constr'lictionrplaced in e ch corner of the den rick, and each legeonstriictionextendslfroni thorizontal'ncrossseetion'taken a corner 0t thebase-construction lli'to. scar; Y

ner .of the crown construction'lz' In ..view

ofthe factthat thefourleg oonstrnctions .7

are identical bothin' construction and operation",'in-the ensuing description I Will describe bnt one double leg .construction,- but it befnnderstoocl that the description applies:

equally Well to the other; three leg constrnm tions of the derrick. v i Referring particularly to "Figs. 3' ahl-j7,

each leg construction "includes a primary leg '16 whioh is preferably made from an angle, bar and installed in'fthe clerrlckwlth thel flanges of the angle bar extending parallel thereto by suitable bolts 19.' The upper'end of the primary leg 1 6' extendswithin a headpiece;20-of the crown'construction 12 there being aheadpiece arranged at each corner thereof. The headpiece 20 includes a pair of upright walls 2lV-which extendperpendim ularly to each other and which'are engaged by the flanges of the primary leg 16.- The primary leg 16 i'sheld in positionagainst the upright ,walls '21 bolts 23 which extend,

through vertically elongated slots 24 of the primary legs lGand also through openings provided in the upright walls 21 Asecondary leg 25',"which formsa part of the doubleleg construotion'14, is preferably tubular in 'cross' section and is'conveniently positioned withinthe primary leg 16, as best retained in this position by suitable holding devices 26; The lower end of the secondary with a semi-spherical bearing member/35 leg is provided with a head 29 which rests in a socket 30'provi'ded the corne'r'piece 18 Beferringtoiliig. 4, theflupper ends of the and a semi eylindrical}bearing"member 36 39 has an uppersemi-sphe'rical bearing ,face' 41 which seatsfon'ia semi-spherical seat 42' generated arou'nda point 43 which'is in sub Vstantially the same horizontal plane. as'the'fcenters 44 and'45 around'whichthe respectively. 7 These'bearing'members35 and" 36 are adapted to be seated in a'semi-sph'erif dal' sea BTa -smiy in i ea 38 e spectively of an equalizing or 'lo'adfpropor tioning member 39 The equalizing member provided by "the "headpiece 20;" The semispherical bearing face 41 and seat42 are bearing faces of the bearingmembers 35 and 36 are generated, "The point" 43 is thefulcrum point around which the equalizing- Inember 39 swings; lThe weight of the crown is applied from the erown to the equalizing member39 and fro n'the equalizingmember' 39 to the primary nd secondary legs 16 and 25;" andi'the load is distributed to the two legs according to the respective lengths of the lever arms and" B. It will be seen that v the relative loads carried by fthe two' 7 legs arepre'determined by: the relative lengths of; the leverarms A and B, and it will further be seen that by designing the equalizing inem ber tohavefdifierentrelative lengths of lever arms, the distribution of the load. will be.

different, 1

equ ing: member r ug For the purpose of looselyconnecting th i equalizing member 39 to the headpieceQQI provide the equalizingfmember 39 with Ide-j pending lugs 47 having vertically elongated openings 48 through which a retaining bar 49 is extended, this retaining bar 49 being held by side walls 50 ofthe headpiece'fZOQ The depending lugs are provided with verti-. cally'elongat ed; openings in order that there will be no interference to all of the'lo'ad being transferred from the headpiece to the e e g g m nt.

" the 9 64 l difih zface 4 A The equalizing member 39 isprovidedwith the extensive bearing'face in 'order'that it "may be fullyma'pablea of transferring the enor 'mous loads to the legs o'f'the derrick. This bearing face i's rnade cylindrical in order that the equalizing member-will swing around. a horizontal axis on j which 'the point 43" is and the equalizing member are provided with semi-spherical" bearings fi l, ,0rder that the equalizing member may; freely adjust; itself to compensateffor any,.'slightmisalignment "of located; The upper end of the primary leg' the f the legs; Y If "de r d; bQth ear I q p members and 36 maybe semi spheric'al. shown 'in Fig. Thesecondary leg may be;

L I consider my inve eenrd he broadlynovel in the provision of a derriok having a double leg constructionin combination means for automat cally lmposilng apredetermined premisesofthe'1 aa1o each1eg. I

y v n on ois urt e f iev i i le z isi n f a equalizing tm' ei si w h: i a l-I wi e v y h We ght ii s s 6n the e and byfvirtueof this'balancing action the equalizing means places a 1 predetermined proportion of the load'on the two legs.

vI'cl im s my hven i n'kj 1.]InQaQderr-1ek, base "constructmn, a

crown'eon'structioma leg fc onstruetion'extend-j n}; etween saids jc nsfimctiqmndi said; crown constructlon, said leg construct on 1n- 1 eluding a pairj of legs, the' combination of:

an equalizing f neans interposed the dera rick structure through 'iwhich the load car: ried by the crown eonstruction is'transmittedl; said equalizing means engaging sai'd legs and riedbfv each Qfsaid legs: 1

. proportioning the amount. said load,car-

ing means supportedby oneof said construm tions and-'fulcrumin'g 'ithereon," 'said legs} engaging *said equalizing? means Lon opposite;

351111 a derrick r th ela'ss described the combination" of a' crown structure leg means including plurality legs whereby said crown strueture'is "supportedfajnd load'dis V tributing means operative to automatically proportion theflo'ad on said legs upon the proportion of the load on each of said legs.

6. In combination with a primary leg, a secondary leg, and a thrust receiving member of an oil well derrick: a thrust dividing device adapted to receive thrust "from said member and divide said thrust in definite proportions between said legs.

7 In combination with a primary leg, a

secondary leg, and a thrust receiving member of an oil well-derrick: a lever fulcrumed on said member and engaging each of said legs at a'definite distance from the fulcrumso that the thrust of said member is divided in definite proportions between said legs.

8. In combination witlia primary leg, a secondary leg, and a thrust receiving member of an oil well derrick :a lever fulcrumed on said member and engaging each of said legs at a definite distance from the fulcrum so that the lever may rock about the fulcrum and divide the thrust thereon in definite PIOPOI. 1

' structlon; aprimary leg extendmg between tionsbetween said legs. 7

9. In a derrick construction, the combination of: a primary leg; a secondary leg; a thrust member; and a swingable lever engaging said primary and secondary legs and said thrust member for proportioning the load of the derrick between said primary and secondary legs. i

10. In a derrick construction, the combination of: aprimary leg; a secondary leg;

a thrust member; and a swingable'lever en gaging said primary and secondary legs and fulcrumed on said thrust member for proportioning the load of the derrick between said primary and secondary legs.

11. In aderrick construction, thecombination of: a primary leg; a secondary leg; a thrust member; and a 'swingable lever engaging said primary and secondary. legs and swingable on said thrust member for proportioning the load of the derrick between.

said primary and secondary legs.

12. In a derrick construction, the combination of: a primary leg; a secondary leg; a thrust member; and load proportioning means disposed between said primary and secondary legs and said thrust member, said load proportioning means being automaticaL' ly adjustable in position forproportioning the load of the derrick between said primary and secondary legs.

13. In a derrick construction, the combination of: a primary leg; a secondary leg; a thrust member; and load proportioning means disposed between said primary and secondary legs and said thrust member, said I load proportioning means being movable with respect to said primary and secondary legs and being automatically adjustable in position for proportioning the, load of the derrick between said primary and secondary legs.

In a derrick jconstruction,-the combination of: a primary leg; a secondary leg; a thrust member having a fulcrum seat; and

a lever engaging said primary and secondary legs, and engaging said fulcrum seat.

'15. In a derrick construction, the combination of: a. primary leg; a secondary-leg; a-

thrust member having an arcuate fulcrum seat; and a lever engaging sald primary and secondary legs, and having an arcuate face I engaging said ,arcuatefulcrum seat. I 16. In a derrick construct1on,the combination of: a primary leg; a se'condaryleg;

a thrust member; load proportioning means disposed between said primary. and secondary legs and said thrust member,'said load proportioning means being automatically adjustable in position for proportioning the load of the derrick between said primary and secondary legs; and means for holding said load proportioning means in-place.

17. In a derrick construction, the combina- I tion of: a base construction; a crown con-" said constructions; a. secondary leg, extending between said constructions; and lever means engaging said primary and secondary V r I legs and one ofsaid constructions for distributing the load of said derrickbetween said legs.

' 18. In a derrick construction, the combination of: a. baseconstructlon; a crown con- 'struction v a primary leg extending between said constructions; a secondary leg extend-j ing between said constructions; and lever means fulcrumed on one of said constructlons and engaging said pr mary and sec ondary legs on opposite sides of the fulcrum for distributing theload of-said derrick be- 1 tween said legs.

In testlmony, whereof, have hereunto set I 

